ML17208A312

Forwards Info in Response to NRC Re Containment Purging & Venting

ML17208A312
Person / Time
Site:	Saint Lucie
Issue date:	03/13/1980
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
L-80-82, NUDOCS 8003190445
Download: ML17208A312 (26)

Text

REGUL'ATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR!8003190445 DOC ~ DATE>> 80/03/13 NOTARIZED:

NO FACILi50 335 St, Lucia Plantr Unit ir 'Florida Power 8 Light Co.

A/TH~ NAME" AU/HOR AFF'ILlATION UHWGrR ~ ED Flotida Power 8 Light Co,,

RECIP >>NAME RECIPIENT AFFILIATION RETDgR ~ HE Operating Reactors Branch SUBJECT!

Forwards info jn response to NRC 800204 its re containment purging L venting, DISTRISUTION CODE7 AOS40 COPIES RECEIVED:LTR g, ENCL..'SIZE:

TITLE: Containment Pur'ging N

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FLORIDA POWER IIv LIGHTCOMPANY March 13, 1980 L-80-82 Office of Nuclear Reactor Regulation Attention:

Mr. R.

W. Reid, Chief Operating Reactors Branch I4 Division of Operating Reactors U. S. Nuclear Regulatory Ccnaussion

Dear Nr. Reid:

Re:

ST. LUCIE UNIT l DOCK1'"T NO. 50-335 CONTAINMENT PURGE The attached information is submitted in response to your letter of Feb-ruary 4, l980 on the subject of containment purging and venting at St.

Lucie Unit l.

Very truly yours, Robert E. Uhrig Vice President Advanced Systems 6 Technology REU!MALS/pa Attachment cc:

Mr. J.

P. O'Reilly, Region II Harold Reis, Esquire 8 OOIIX&6 0v+K PEOPLE... SERVING PEOPLE

A l

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ATTACHMENT Re:

St. Lucie Unit 1

Docket No. 50-335 Containment Pur e

The following information is supplied in response to a February 4, 1980 NRC Request for Additional Information regarding containment purging and venting system at St.

Lucie Unit 1.

The information is numbered to correspond to the numbering sequence in the Information Request.

l.a, l.b, 8 l.c Certain Safety Actuation Signals (SAS) can be blocked to allow normal plant operations (e.g.,

shutdown) without safeguards actuation.

These blocks are key lock operated and can only be applied if certain conditions are met (RCS pressure less than Technical Specification Limit, Main Steam pressure less than Technical Specification Limit).

Actuation of either of these blocks is annunciated at the system level and the blocks are automatically removed if the Technical Specification Limit is exceeded, which results in re-arming the SAS.

In addition, blocking of either of these signals does not block any other SAS (e.g.,

high containment pressure).

Several safeguard components can be overridden to the OFF position at the individual component control switch provided that a

SAS is not present.

This is separately annunciated for each component and there are administrative procedures restricting the use of this feature to ensure that limiting conditions for operation are met.

Individual channels of a SAS can be bypassed.

Key lock switches are required and this action is annunciated at the system level.

Only one channel of a given function can be bypassed at a time, this changes the initiating logic from a "two out of four" to a "two out of three" configuration.

l.d Containment isolation (CIS) is initiated from Containment High Radiation, Containment High Pressure or Safety Injection Actuation Signal.

l.e The instrumentation and control systems provided to initiate engineered safeguards (ESF) are designed and qualified as safety-grade equipment.

Resetting of the isolation signal will not cause the automatic motion of any ESF valve.

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The following drawings are, attached:

FSAR Figure 9.4-4, Control Room A/C System FSAR Figure 12.2-4, Containment Purge System P8ID 8770-8-326 Sheet 482, Reactor Containment 5 Shield (Schematic) 8770-8-326 Sheet 490, Control Room Emergency Filtration Fan (Schematic) 8770-B-326 Sheet 492, Control Room A/C (Schematic) 8770-B-326 Sheet

509, Purge Exhaust Fan HVE-8A (Schematic) 8770-B-326 Sheet

510, Purge Exhaust Fan HVE-8B (Schematic) 8770-B-326 Sheet 511, Containment Purge Isolation Valves (Schematic) 8770-8-326 Sheet 512, Containment Purge Isolation Valves (Schematic)

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